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Structure of DNA
Purine and pyrimidine nucleotides are the building blocks of DNA. Adenine specifically binds to thymine with 2 hydrogen bonds and cytosine specifically binds to guanine with three hydrogen bonds. Hydrogen bond is a type of attractive intermolecular force that exists between two partial electric charges of opposite polarity. Two strands of DNA are anti parallel with major and minor grooves.

DNA replication
The process of making an identical copy of a section of duplex DNA, using existing DNA as template for the synthesis of new DNA strands. DNA undergoes semi conservative nature of replication. There are three steps in the replication process: Initiation, elongation and termination. Initiation always begins at the origins of replication, it is bidirectional with most genomes and priming is with RNA. Elongation has three steps: unwinding of DNA, relieving of torsional stress and polymerization of poly nucleotide chain. One strand of DNA is made continuously while the other strand is synthesized in fragments.

Purine and pyrimidine nucleotides are the building blocks of DNA. Adenine specifically binds to thymine with 2 hydrogen bonds and cytosine specifically binds to guanine with three hydrogen bonds. Two strands of DNA are anti parallel with major and minor grooves. DNA undergoes semi conservative nature of replication. There are three steps in the replication process: Initiation, elongation and termination. Many enzymes are involved in DNA replication such as topoisomerase, helicase, primase, DNA polymerase and ligase.